Fuel Pressure Regulator: Description and Operation

Description
The fuel pressure regulator:

^ regulates the fuel pressure supplied to the fuel injectors.

^ is mounted on the fuel injection supply manifold downstream of the fuel injectors.

Fuel Pressure Regulator:

Construction and Operation

The fuel pressure regulator:

^ is a diaphragm-operated relief valve in which one side of the diaphragm senses fuel pressure and the other side is subjected to intake manifold vacuum.

^ nominal fuel pressure is established by a spring preload applied to the diaphragm.

^ balances one side of the diaphragm with manifold pressure to maintain a constant fuel pressure drop across the fuel injectors.

^ bypasses and returns excess fuel to the fuel tank.